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    #1

    Toshiba 32AV502R

    Model: Toshiba 32AV502R
    Issue: Picked this tv up for 15$ worked one day and next didn't or so i was told

    Symptoms: When Fully Powered down and turned back on Power comes on, very top of the screen tries to light up very very very quick and dim green light is flashing on the TV and doesn't stop flashing.

    All voltages are outta whack hear noises coming from the power board here where i have a video to help.

    163.8 coming off the main cap when powered on however.

    http://www.youtube.com/watch?v=KU6opm7Tdd0
    Attached Files
    Tags: None
    #2
    Re: Toshiba 32AV502R

    Originally posted by Vizor View Post
    163.8 coming off the main cap when powered on however.
    1) What is the DC voltage across the startup cap, C207 (right by the SP2)? Is it steady or fluctuating?

    2) What is the SMPS IC part number right by the startup cap?
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      #3
      Re: Toshiba 32AV502R

      1) What is the DC voltage across the startup cap, C207 (right by the SP2)? Is it steady or fluctuating?

      Voltages all over the place unstable.

      2) What is the SMPS IC part number right by the startup cap?

      CHN
      Viper27L
      KV3848

      Comment

        #4
        Re: Toshiba 32AV502R

        Originally posted by Vizor View Post
        1) What is the DC voltage across the startup cap, C207 (right by the SP2)? Is it steady or fluctuating?

        Voltages all over the place unstable.
        If you have an ESR meter, check the startup cap, otherwise try replacing the startup cap first, it is the easiest.
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          #5
          Re: Toshiba 32AV502R

          Originally posted by Vizor View Post
          Viper27L
          1) Refer to figure 3

          https://cdn.badcaps-static.com/pdfs/...9c18eaaac3.pdf

          2) See if GND is shorted to VDD (pin 1 to 2).

          3) Measure the DC voltage on pin 2 (using pin 1 as GND). Be specific in the range that it is wildly fluctuating.
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            #6
            Re: Toshiba 32AV502R

            Originally posted by Vizor View Post
            1) What is the DC voltage across the startup cap, C207 (right by the SP2)? Is it steady or fluctuating?

            Voltages all over the place unstable.
            Be specific in the range that it is unstable. With your above description, I have no idea if is unstable between 1V and 166V.

            If your multimeter has min/max, use to see what the lower and upper range.
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              #7
              Re: Toshiba 32AV502R

              Replaced C207 and no change. the blueish thing next to the transformer is the biggest noise i hear PHSl04J 800VHoB

              Comment

                #8
                Re: Toshiba 32AV502R

                Originally posted by retiredcaps View Post
                Be specific in the range that it is unstable. With your above description, I have no idea if is unstable between 1V and 166V.

                If your multimeter has min/max, use to see what the lower and upper range.
                5.34v
                max 13.46v

                Comment

                  #9
                  Re: Toshiba 32AV502R

                  Originally posted by Vizor View Post
                  5.34v
                  max 13.46v
                  same thing on the IC also.

                  Comment

                    #10
                    Re: Toshiba 32AV502R

                    Check the resistor and diode feeding off the transformer for the cap (on primary side.)

                    Check all diodes on secondary for shorts.
                    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                      #11
                      Re: Toshiba 32AV502R

                      Originally posted by Vizor View Post
                      same thing on the IC also.
                      On page 6 of the pdf, the VDDon is 14V DC typical. The minimum is 13V and max is 15V. So it looks like the SMPS IC is trying to start if the max is 13.46V DC. This is why the actual readings are critical.

                      Since you changed the startup cap, this means that there is probably a shorted diode on the board causing the SMPS to startup, shutdown, startup, shutdown, etc.

                      I see at least two diodes right by the startup cap, possibly 3. There is also another underneath the big yellow transformer. Test them all and others that you find with your diode test function. If one is shorted, it will give the same reading in both directions.

                      If you cannot find a shorted diode, then the SMPS is the next suspect which is why I asked you to check for a short between GND and VDD.

                      edit: Ahh, tom66 beat me while I was reading the datasheet.
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                      Comment

                        #12
                        Re: Toshiba 32AV502R

                        TVS1 Dead/Zero nothing.
                        Attached Files

                        Comment

                          #13
                          Re: Toshiba 32AV502R

                          D500 is Bad and D203 is Open
                          Attached Files

                          Comment

                            #14
                            Re: Toshiba 32AV502R

                            TVS1 is a surge protection device - it is normal for it to appear open circuit on a typical test.

                            However D500 is probably the fault if it appears short circuited. Does it?

                            D203 -> could be faulty, but please remove it and read off the part # so we can tell if it is a TVS or otherwise.
                            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                              #15
                              Re: Toshiba 32AV502R

                              Small one: PS!010R Dec 9019

                              Big one: 09016 SB540

                              Comment

                                #16
                                Re: Toshiba 32AV502R

                                Can't seem to find them on Digi

                                Comment

                                  #17
                                  Re: Toshiba 32AV502R

                                  Maybe these
                                  If you can decrypt the right one
                                  https://cdn.badcaps-static.com/pdfs/...cccfb3af1d.pdf,
                                  and this for the big one,
                                  https://cdn.badcaps-static.com/pdfs/...f3ff9c0fdf.pdf.
                                  Both readily available
                                  Most of the time things ain't what they seem to be

                                  Comment

                                    #18
                                    Re: Toshiba 32AV502R

                                    @s2udio2
                                    "Most of the time things ain't what they seem to be "

                                    You may be correct but why isn't the small one ( PS!010R) of these:

                                    https://cdn.badcaps-static.com/pdfs/...9c194b055a.pdf
                                    Please upload pictures using attachment function when ask for help on the repair
                                    http://www.badcaps.net/forum/showthread.php?t=39740

                                    Comment

                                      #19
                                      Re: Toshiba 32AV502R

                                      lol i have no idea what they are either i just wrote down what i see.

                                      Comment

                                        #20
                                        Re: Toshiba 32AV502R

                                        That D203 may be the Snubber diode (about 200V rating) which in parallel with the primary winding of the transformer, it will read low Ohm due to the low DC resistance of the winding. Verify if the Diode is in parallel with the transformer winding.
                                        Last edited by budm; 04-25-2012, 10:49 PM.
                                        Never stop learning
                                        Basic LCD TV and Monitor troubleshooting guides.
                                        http://www.badcaps.net/forum/showthr...956#post305956

                                        Voltage Regulator (LDO) testing:
                                        http://www.badcaps.net/forum/showthr...999#post300999

                                        Inverter testing using old CFL:
                                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                        http://s807.photobucket.com/user/budm/library/

                                        TV Factory reset codes listing:
                                        http://www.badcaps.net/forum/showthread.php?t=24809

                                        Comment

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